Random Thunk While Driving

[ViperDoc]

Did you ever get to the bottom of this? I've had this happen five times in 300 miles with a brand new 2020 M3P, accompanied by unusually harsh ride quality.

Do we know what this might be?

No, unfortunately not. Still a random event.

 

[super20g]

It is probably the battery case expanding when the battery warms up? Usually during supercharging, elevation changes, etc. that works the battery harder. At least that is what mine does. It is not documented in the manual anywhere but Tesla told me it is a normal characteristic, lol. If it is normal, you would think they would note it in the manual so owners are aware instead of always checking the review to see if they ran over something...

 

[MentalNomad]

It's totally temperature-related. You can do the same with a large steel sink in a cold place when you run hot water over it.

In fact, a Tesla driver has posted a video demoing this with a large sink, showing how it's the same sound they hear.

 

[MentalNomad]

(The OP may not have noticed it before their first winter / cold weather if they got their car in spring or summer.)

 

[BikerPeaBody]

I thought this was normal?
supposed to be the battery packs expanding and stuff right?

 

[webbah]

Here’s the TSB:

 

[super20g]

They don't want to apply the TSB anymore it seems, service (and owners) say it doesn't stop the issue. Perhaps makes it a bit quieter.

 

[webbah]

They don't want to apply the TSB anymore, service (and owners) say it doesn't stop the issue. Perhaps makes it a bit quieter.

Depends on the service center. I know of a few that have recently done it in Switzerland. It doesn’t completely resolve the issue and I’ve had it done. Now I’d say it happens with 80% less frequency.